Computer restarting randomly logs included

My computer will randomly restart, as if the power went out but everything else is still on. I've unplugged everything from the power strip, besides computer,monitor, and modem. When the computer turns back on it takes awhile for it to load back up, sometimes the monitor only has power, or keyboard, or just the CPU. It happens more frequently when playing WOW (world of warcraft) Logs are attached thank you for the help.